Magazine tack hammer



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Aug. 25, 1925.

D. C. TODD MAGAZINE TACK HAMMER Filed oct. 11.

1924 2 Sheets-Sheet l WITNESS ATTORNEYS Aug'. 25, 1925.

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` ATTORNEYS if? Patented Aug. 25, 1925.

UNITED STATES PATENT OFFICE.

DAVID CROSLAND TODD, OF SPARTANBURG, SOUTH CAROLINA..

MAGAZINE TACK HAMMER.

Application led October 11, 1924. Serial No. 743,071.

To all 'whom t may concern:

Be it known that I, DAvrD CRosLAND TODD, a citizen of the United States, and a resident of Spartanburg, in the county of Spartanburg and State of South Carolina, have invented certain new and useful Improvements in Magazine Tack Hammers, of which the following is a specification.

This invention relates to tack hammers and has for its object the provision of a hammer having a magazine which is adapted to store a plurality of U-shaped tacks with a mechanism for feeding the tacks automatically as the tacks are driven into position and sheared off.

A further object of the invention is the provision of a device for automatically feeding tacks consecutively beneath the driving head of a hammer, the tacks being supplied in strips and sheared periodically by a knife connected with the movable driving head.

This invention will be best understood from a consideration of the following detailed description, in view of the accompanying drawing forming a part of the specification; nevertheless it is to be understood that the invention 'is not confined to the disclosure, being susceptible of such changes and modifications which shall define no material departure from the salient features of the invention as expressed in the appended claims.

In the drawings:

Figure 1 is a side view of the magazine tack hammer.

Figure 2 is a vertical longitudinal section of the tack hammer.

Figure 3 is a horizontal section of the tack hammer.

Figure 4: is a plan view of the tack hammer.

Fi ure 5 is a vertical section taken along the line 5 5 of Figure 2.

Figure 6 is a view in perspective of the movable driving head.

Figure 7 is a view in perspective of the automatic feeding means for the tacks.

Figure 8 shows a blank from which the U-shaped tacks are formed in strips.

Referring more particularly to the drawings, 1 designates a head having the usual claws 2 and a chamber 3 within the head, One face of the rigid head has an opening which is closed by a cover plate 4 whereby it is ossible to inspect the magazine Within the c amber 3 by removal of the screws 5 which connect the cover plate 4 to the head 1. A hollow handle 6 is secured to the stationary head 1 by means of screws 7 and 8. The screws 8 are adapted to rigidly position one end of a flat spring 9 within the chamber 3. The outer end of the head 1 is provided with an opening across which is slidable a movable driving head 10. The head is limited in its movement by the length of the slot 11 formed in the side of the movable head and in which is threaded a head of a screw 12 connected with the rigid head 1.

The side wall of the rigid head 1 is provided with grooves 13 adapted to receive the ribs 14: formed on the rearwardly extending flanges 15 of the movable head 10. The movable head has a central head 16 fitting between the inner faces of the for- Ward ends of the side walls of the head 1 and a knife flange. 17 is formed on the lower end adapted to shear a U-shaped tack 18 which is projected automatically beyond the forward edge 19 of the track 20 upon which the strip of connected tacks travel.

The spring 9 has its free end located within a notch 21 in the movable head 10 and is adapted to maintain the head in its most elevated position. The track 20 is formed upon the bottom wall 22 and is alined with a track 23 formed on the bottom wall of the hollow handle 6. Rollers 24: mounted in the chamber 3 are adapted to engage the upper end of the strip 25 of the tacks for guiding them in place. A toothed wheel 26 mounted in the hollow handle 6 is adapted to be operated through an external handle 27 and with the teeth engaging the perforations 28 ofthe strip 25 and for feeding the strip along the tracks and to a point where the movable head is adapted to engage the tacks for shearing them and driving them to a fixed position.

The strip is automatically fed by a mechanism operated by the movable head 10 and comprises a bell crank lever 29 pivotally mounted at 30 in the chamber 3 and having its free end 31 resting in a notch 32 in the movable head 10. A feeding mechanism is operated by the lever 29 and comprises a bar 33 having a pin 34tconnected with the arm 35 of the bell crank lever 29 with the pin operating in slots 36 of an upward extension 37 of a presser foot 38. The presser foot is adapted to guide the feeding mechanism on the forward end of the bar 33 as shown at 39 and the toe 40 projects below the lower edge of the presser foot 38 and engages the perforations 28 in the strip of tacks 25 and moves the strip forwardly and periodically at each reciprocation of the rods 33 through the bell crank lever 29.

The presser foot is pivotally mounted as shown at 41 to the side walls of the chainber 3 of the fixed head 1. The presser foot has a curved extension as shown at 42 which engages the strip of tacks adjacent the point where the knife 17 operates along the vertical edge 19 of the forward end of the track 20.

The strip of tacks shown in Figure 8 are cut out of a blank with the points 44 of the tacks projecting in opposite directions and the central portion of the tacks perforated as shown at 28 to receive the toe 40 for moving the tacks periodically along the tracks 20. The strip of tacks are bent along certain lines upon opposite sides of the row of perforations 28 to form U-shaped tacks which slide along the track 2O with the legs of the tacks embracing opposite faces of said track.

As shown more particularly in Figure 1 the cover plate 4 is provided with an opening shown at 45 whereby the tacks may be projected in their movement along the track or whereby a tool may be inserted in the opening to urge the tacks forwardly when they become jammed by some disturbance in the operating mechanism for shifting the tacks automatically under the driving head 10.

As the head 10 is moved downwardly as shown in Figure 2 the cutting edge 17 shears olf a U-shaped tack 18 from the strip and drives the same into a fixed position where desired. The spring member 9 is of sufhcient strength to return the driving head 10 to its normal inoperative position as soon as the driving action has been coinpleted, also returning the bell crank lever 28 to its position shown in Figure 2. The downward movement of the driving hea-d 10 causes a rearward shifting of the presser foot and the toe 40 of the feeding mechanism so that when the driving head is returned by the spring 9 to its inoperative position the bell crank lever 2S will be operated and cause the toe 40 to be moved forwardly and shift alongl a U-shaped tack beneath the cutting and driving` head of the hammer so that the device is in position for driving another tack.

Vhat I claim is:

1. A tool for driving double-pointed tacks comprising a hollow head, aA dig-iving and cutting element for a ribbon of tacks slidably mounted on the hollow head, a track for the tacks, a presser foot, means carried by the presser foot and operated by the movement of the driving clement for feeding the t-acks, said driving element having a cutting edge cooperating with the end of the track for shearing the tacks from the ribbon, and a resilient means for causing the driving element to be maintained in an inoperative position.

A tool for driving double-pointed tacks comprising a hollow head, a driving and cutting element for a ribbon of tacks, slidably mounted on the hollow head, a

/llalkmloglmthemtacks, a presser foot, means carried by the presser foot and connected to the driving element and adapted to be actuated by said driving element for feeding the tacks, said driving element having a cutting edge cooperating with the end of the track for shearing the tacks from the ribbon, and a roller disposed above the track for holding the ribbon of tacks on the track.

3. A tool for driving double-pointed tacks comprising a hollow head, a driving and cutting element for a ribbon of tacks slidably mounted on the hollow head, a track for the tacks, means operated by the movement of the driving element for feeding the tacks, said driving element having a cutting edge cooperating with the end of the track for shearing the tacks from the ribbon, and means for feeding the ribbon of tacks to the feeding means in the hollow head.

4. A tool for driving double-pointed tacks comprising a hollow head, a driving and cutting element for a ribbon of tacks slidably mounted in the hollow head, a track for the tacks, a presser foot pivotally mounted for maintaining the tacks on the track, a lever pivotally mounted in the head and connected with the driving element, and a pawl carried by the presser foot and adapted to be actuated by the lever when the head is reciprocated for shifting the tacks along the track.

5. A tool for driving double-pointed tacks comprising a hollow head, a driving and cutting element for a ribbon of tacks slida-blv mounted in the hollow head, a track for the tacks, a presser foot pivotally mounted for maintaining the tacks on the track, a lever pivotally mounted in the head and connected with the driving element, a pawl carried by the presser foot and adapted to be actuated by the lever when the head is reciprocated for shifting the tacks along the track, and means for feeding the ribbon of tacks to the pawl on the presser foot.

DAVID CROSLAND TODD. 

